future continuous con to be going to

will be doing be going to be doing
They are going to be waiting for him when he arrives tonight.
They will be waiting for him when he arrives tonight.
Essi staranno aspettando lui quando lui arrivera' stanotte.

-Future Perfectil future perfect si usa per dire che qualcosa
sara' finito in un particolare tempo nel futuro
In six years I will have retired and I will be able to enjoy my hobbies
in sei anni saro' andato in pensione e sara' in grado di godere i miei hobbies

quando si usa il future perfect e' facile imbattersi in in oppure by
probably sarah will have gone to Australia by 2033
probabilmente Sarah sara' andata in australia entro il 2033
She will have finished her test in tho hours
Lei avra' terminato il suo test in due ore